German technical background VOK-167 Wetting dispersant Improve color intensity, transparency and hiding power replaces BYK-167

German technical background VOK ®- Disper 167 Wetting Dispersant

VOK ®- Disper 167 is a wetting and dispersing agent for solvent based coatings and pigment concentrates. Stable for all types of pigments. It has a wide range of compatibility, so it is suitable for general pigment concentrated slurry using aldehyde ketone resin and acrylic resin as grinding resin. It's VOK ®- Disper 163 is aromatic free.

Product Information

Chemical composition

Modified polyurethane solution

Typical Physicochemical Data

The data given in this data page are only typical values, not technical indicators of the product.

Amine value: 12.5 mg KOH/g

Density (20 ° C): 1.05 g/ml

Non volatile matter (20 minutes, 150 ° C): 52%

Solvent: propylene glycol methyl ether acetate/butyl acetate 2/1

Flash point: 35 ° C

Storage and transportation

Delamination or turbidity may occur. Heat to 30-60 ° C and mix thoroughly before use.

Special reminder

The post-treatment of some organic pigments will have a negative impact on the performance of the additive. In this case, the same type of untreated pigment can be used. When applied to coil coatings, the interaction between the cationic promoter and acid catalyst must be considered. Free acid or epoxy blocked acid is more suitable than amine blocked acid. This problem can be solved by using VOK ®- Disper 170 series additives.

Application field

Coating industry

Features and Benefits

The additive makes the pigment deflocculate and stable through steric hindrance, and it also makes the pigment particles have the same charge. The resulting repulsive effect and steric stability prevent the pigment from co flocculation, thus obtaining the color without floating and blooming in the system containing multiple pigments. The flocculating property of the additive can improve the luster, color strength, transparency and hiding power, and reduce the viscosity of the abrasive.

Recommended use

The auxiliary agent is VOK ®- Disper 163 is aromatic free and can be used in many solvent based formulations. It can also be used for post addition for batch remediation. For the new formula, it is recommended to test the new product VOK ®- Disper 2164。

Recommended dosage

The amount of additives (purchase form) is based on:

Inorganic pigment: 15-20%

Titanium dioxide: 4-5%

Organic pigment: 30-60%

Carbon black: 80-100%

The above recommended dosage is for reference, and the appropriate dosage shall be determined through a series of tests.

Adding method and processing guidance

In order to obtain good performance, additives must be added to the grinding material first, and then the pigment.

Premix the resin and solvent components in the abrasive, and then slowly add the auxiliary agent in the state of continuous stirring. Do not add pigments when the auxiliaries have not been completely dispersed evenly.

When it is used for post addition (to remedy defective batches), the additive should be added slowly under high shear force.